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- W2316502145 abstract "Most of the previous studies on ovarian hyaluronan (HA) have focused on mature antral follicles or corpora lutea, but scarcely on small preantral follicles. Moreover, the origin of follicular HA is unknown. To clarify the localization of HA and its synthases in small growing follicles, involvement of HA in follicle growth, and gonadotropin regulation of HA synthase ( Has ) gene expression, in this study, perinatal, immature, and adult ovaries of Wistar-Imamichi rats were examined histologically and biochemically and by in vitro follicle culture. HA was detected in the extracellular matrix of granulosa and theca cell layers of primary follicles and more advanced follicles. Ovarian HA accumulation ontogenetically started in the sex cords of perinatal rats, and its primary site shifted to the intrafollicular region of primary follicles within 5 days of birth. The Has1 – 3 mRNAs were expressed in the ovaries of perinatal, prepubertal, and adult rats, and the expression levels of Has1 and Has2 genes were modulated during the estrous cycle in adult rats and following administration of exogenous gonadotropins in immature acyclic rats. The Has1 and Has2 mRNAs were predominantly localized in the theca and granulosa cell layers of growing follicles respectively. Treatments with chemicals known to reduce ovarian HA synthesis induced follicular atresia. More directly, the addition of Streptomyces hyaluronidase, which specifically degrades HA, induced the arrest of follicle growth in an in vitro culture system. These results indicate that gonadotropin-regulated HA synthesis is involved in normal follicle growth." @default.
- W2316502145 created "2016-06-24" @default.
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- W2316502145 date "2014-02-01" @default.
- W2316502145 modified "2023-09-27" @default.
- W2316502145 title "Involvement of hyaluronan synthesis in ovarian follicle growth in rats" @default.
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- W2316502145 doi "https://doi.org/10.1530/rep-13-0464" @default.
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